神机妙算细又巧.(计算下面各题能简算的要简算)21.28-21.28÷7×30.32×25×12.52.5×4.7-2.5+2.5×6.3
神机妙算细又巧.(计算下面各题能简算的要简算)21.28-21.28÷7×30.32×25×12.52.5×4.7-2.5+2.5×6.3(77.4-3.096÷0.4)...
神机妙算细又巧.(计算下面各题能简算的要简算)21.28-21.28÷7×30.32×25×12.52.5×4.7-2.5+2.5×6.3(77.4-3.096÷0.4)÷0.037.74×(2.8-1.3)+1.5×2.26.
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(1)21.28-21.28÷7×3, =21.28-3.04×3, =21.28-9.12, =12.16; (2)0.32×25×12.5, =0.8×0.4×25×12.5, =(0.8×12.5)×(0.4×25), =10×10, =100; (3)2.5×4.7-2.5+2.5×6.3, =2.5×(4.7-1+6.3), =2.5×10, =25; (4)(77.4-3.096÷0.4)÷0.03, =(77.4-7.74)÷0.03, =69.66÷0.03, =2322; (5)7.74×(2.8-1.3)+1.5×2.26, =7.74×1.5+1.5×2.26, =1.5×(7.74+2.26), =1.5×10, =15. |
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