总述：本次共解2题。其中
           ☆算术计算2题

〖1/2算式〗
    作业：求算式 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1 的值.
    题型：数学计算
    解:
          1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =3+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =6+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =10+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =15+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =21+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =28+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =36+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =45+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =55+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =66+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =78+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =91+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =105+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =120+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =136+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =153+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =171+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =190+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =210+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =231+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =251+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =270+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =288+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =305+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =321+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =336+14+13+12+11+10+9+8+7+6+5+4+3+2+1
        =350+13+12+11+10+9+8+7+6+5+4+3+2+1
        =363+12+11+10+9+8+7+6+5+4+3+2+1
        =375+11+10+9+8+7+6+5+4+3+2+1
        =386+10+9+8+7+6+5+4+3+2+1
        =396+9+8+7+6+5+4+3+2+1
        =405+8+7+6+5+4+3+2+1
        =413+7+6+5+4+3+2+1
        =420+6+5+4+3+2+1
        =426+5+4+3+2+1
        =431+4+3+2+1
        =435+3+2+1
        =438+2+1
        =440+1
        =441
    答案:1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1=441
〖2/2算式〗
    作业：求算式 0.2×2+0.4×4+0.6×6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18 的值.
    题型：数学计算
    解:
          0.2×2+0.4×4+0.6×6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18
        =0.4+0.4×4+0.6×6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18
        =0.4+1.6+0.6×6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18
        =0.4+1.6+3.6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18
        =0.4+1.6+3.6+6.4+1×10+1.2×12+1.4×14+1.6×16+1.8×18
        =0.4+1.6+3.6+6.4+10+1.2×12+1.4×14+1.6×16+1.8×18
        =0.4+1.6+3.6+6.4+10+14.4+1.4×14+1.6×16+1.8×18
        =0.4+1.6+3.6+6.4+10+14.4+19.6+1.6×16+1.8×18
        =0.4+1.6+3.6+6.4+10+14.4+19.6+25.6+1.8×18
        =0.4+1.6+3.6+6.4+10+14.4+19.6+25.6+32.4
        =2+3.6+6.4+10+14.4+19.6+25.6+32.4
        =5.6+6.4+10+14.4+19.6+25.6+32.4
        =12+10+14.4+19.6+25.6+32.4
        =22+14.4+19.6+25.6+32.4
        =36.4+19.6+25.6+32.4
        =56+25.6+32.4
        =81.6+32.4
        =114
    答案:0.2×2+0.4×4+0.6×6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18=114

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