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456÷125÷8=( )如何脱式计算,怎么能用最简单方法去算

456÷125÷8 =456÷(125×8) =456÷1000 =0.456

456÷6+289脱式计算 =76+289 =365

(1)125×8×7=1000×7=7000(2)6×(456-249)=6×207=1242(3)500-36×5 =500-180=320(4)(340-160)×8=180×8=1440

1000-456 =1000-(400+50+6) =1000-400-50-6 =600-50-6 =550-6 =444

456×98÷456 =456÷456×98 =1×98 =98

=327+456-189+126-34 =327+(456-34)-(189-126) =327+422-63 =749-63 =686

几位数乘除?

456除以括号460-32×14括号脱式计算 456除以括号460-32×14括号 =456÷(460-448) =456÷12 =38

123×234÷123×345÷456÷234×456 =(123 ÷ 123)x(234 ÷ 234)x(456 ÷ 456)x345 =1x1x1x345 =345

456+368 =(400+300)+(56+68) =700+124 =824

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