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脱式计算.0.8×(12.5+

(1)0.8×(12.5+1.25)=0.8×12.5+0.8×1.25=10+1=11;(2)7.75×[20÷(3.24-3.04)=7.75×(20÷0.2)=7.75×100=775;(3)4.05÷0.81+2.4=5+2.4=7.4.

(8+0.08)*12.5脱式计算 =8x12.5+0.08x12.5 =100+1 =101

原式 =(12.5x0.8)x(0.5x0.4) =10x0.2 =2

(1)0.8×4×2.5×12.5 =(0.8×12.5)×(4×2.5)=10×10=100; (2)4.3×7+4.3×2+4.3=4.3×(7+2+1)=4.3×10=43.

=0.8×7×12.5+0.8×3×12.5=0.8×12.5×(7+3)=10×10=100

12.5×7.8×0.8 =12.5×0.8×7.8 =10×7.8 =78

0.25×32×12.5 =0.25×(4×8)×12.5 =(0.25×4)×(8×12.5) =1×100 =100

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

0.8×4×12.5×2.5 =(0 .8*12.5)*(4*2.5) =10*10 =100 使用乘法交换律 谢谢采纳

(53.76-17.6)÷1.8 =36.16÷1.8 =20又4/45 (0.8×7+4.56÷1.9)×12.5 =0.8*12.5*7+2.4*12.5 =0.8*12.5*7+0.8*12.5*3 =10*(7+3) =100 15.73-(2.17+0.73)-1.83 =15.73-0.73-(2.17+1.83) =15-4 =11

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