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①1.25×0.25×0.8×4②29.8%(9.8+2.99÷2.3)③( 16 ...

①1.25×0.25×0.8×4=(1.25×0.8)×(0.25×4),=1×1,=1;②29.8-(9.8+2.99÷2.3)=29.8-(9.8+1.3),=29.8-11.1,=18.7;③(16 1 10 -15.3)× 1 6 ×2.4,=0.8× 1 6 ×2.4,=0.32;④1.75×0.25+0.25×6.25=0.25×(1.75+6.25),=0.25×8,=2;⑥( 3 8...

①7.6-4.8+8.4-5.2,=(7.6+8.4)-(4.8+5.2),=16-10,=6;②4×0.8×2.5×1.25,=(4×2.5)×(0.8×1.25),=10×1,=10;③79×1314+29÷1413,=79×1314+29×1314,=(79+29)×1314,=1×1314,=1314;④1375-375÷15×18,=1375-25×18,=1375-450,=925;⑤...

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(127+133)+240+184

不想说什么了,上面的答案除了最后一个是正确的外,都是错的.仅纠正第一个答案 (2/3+6/11×11/18)÷11/32 =(2/3+6/18)/(32*11) =1/352

4.4÷11=0.4 0.3×0.3=0.09 0÷730=0 0.03×10-0.1=0.27÷5=1.4 0.25÷0.5=0.5 0.53×7=3.71125×0.5×0.8=501.9×0.5=0.95 29×5=145 2.3×0.8=1.84 0.2×7.6×50=76

(29.8-x)÷4=1.9 29.8-x=1.9X4 x=29.8-7.6 x=22.2

5050

原式=(1+29)x29÷2 =30x29÷2 =870÷2 =435 或者: (1+29)+(2+28)+(3+27)+……+(14+16)+15 =30+30+30+……+30+15 =30x14+15 =420+15 =435

(1)580×70=40600; 5 8 0× 7 0 . 4 0 6 0 0 (2)208×56=11648, 2 0 8× 5 6 . 1 2 4 8 1 0 4 0 1 1 6 4 8验算:11648÷208=56; 5 62 0 81 1 6 4 8 1 0 4 0 1 2 4 8 1 2 4 8 0(3)10800÷16=800; 8 0 01 61 0 8 0 0 1 0 8 0 0 0 (4)298÷29=...

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