简算5.6乘69.32 138.64乘0.05 693.2乘0.43
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![简算5.6乘69.32 138.64乘0.05 693.2乘0.43](/uploads/image/f/6656671-55-1.jpg?t=%E7%AE%80%E7%AE%975.6%E4%B9%9869.32+138.64%E4%B9%980.05+693.2%E4%B9%980.43)
19.99*19.98-19.97*19.96=(19.97+0.02)*19.98-19.97*(19.98-0.02)=(19.97*19.98+0.02*19.98)-(19.97*19.98-
4再答:157.再答:5
我再答:
101乘26.9减1.25乘26.9乘0.8=101×26·9-26·9×(1.25×0.8)=101×26·9-26·9×1=26·9×(101-1)=26·9×100=2690
150
25乘32乘0.25=25x8x4x0.25=200x1=200
先用12.5乘以8=100100乘以0.2=2020乘以4.1=82最后答案82
1.25×24×0.25=1.25×8×3×0.25=(1.25×8)×(3×0.25)=10×0.75=7.5很高兴为您解答,【the1900】团队为您答题.请点击下面的【选为满意回答】按钮.
167*69-69*67=69*(167-67)=69*100=6900
0.54*2.08+5.6*0.208一0.208=0.54*0.208+5.6*0.208—0.208*1=(0.54+5.6—1)*0.208=2.08这是我在静心思考后得出的结论,如果不能请追问
1999×2000=(2000—1)×2000=2000×2000—1×2000=4000000—2000=3998000再答:199×20000=(200—1)×20000=200×20000—1×
5.6*69.32+138.64*0.05+693.2*0.43=5.6*0.1*693.2+693.2*0.2*0.05+693.2*0.43=0.56*693.2+693.2*0.01+693.2
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5.6+7.8+4.4=5.6+4.4+7.8=10+7.8=17.82.5x12.5x8x0.4=(2.5x0.4)x(12.5x8)=1x100=10015.8-7.32-2.68=15.8-(7
(7778+6666)×3.333+7778×3.333再答:是加7778×3
999.999×2.8+333.333×0.8=333.333×3×2.8+333.333×2.8=333.333×8.4+333.333×2.8=333.333×(8.4+2.8)=333.333×
125乘25乘3=25x25x15=25x25x(16-1)=25x25x16-25x25=25x4x(25x4)-625=10000-625=9375
1995乘1995-1993乘1996=1995乘1995-1993乘(1995+1)=1995乘1995-1993乘1995-1993=1995×(1995-1993)-1993=1995×2-19
把53.7缩小10倍,71.8扩大10倍的5.37×2.82+5.37×718,再用乘法分配律