4.2×0.99+4.2简算
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4.245%+5.8简算4.2*45%+5.84.2*45%+5.8*20分之9=4.2*9/20+5.8*9/20=10*9/20=4.545%=45/100=9/20所以4.2乘以9/20+5.8乘以9/20=(4.2+5.8)乘以9/
4.2设长方形EFGH叫正方形于EFGH,叫AB于E,AD于F,叫AC于M,很显然RT三角行AEF为等腰直角三角行,则AM=1/2EF=1/2所以AC=EH+2AM=6+2*1/2=7正方行面积=7*7/2=49/2设正方形的对角线长为2x
简算5.4×58-4.2×54
2.8×7.5-4.2×2.75简算2.8×7.5-4.2×2.75=1.4x2x7.5-1.4x3x2.75=1.4x(15-8.25)=1.4x6.75=0.8x2x6.75=0.8x13.5=0.8x12.5+0.8=10+0.8=1
4.2-1.38+5.8-3.62简算4.2-1.38+5.8-3.62=(4.2+5.8)-(1.38+3.62)=10-5=5
简算:4.2/4+3.8*25%4.2/4+3.8*25%=4.2*25%+3.8*25%=(4.2+3.8)*25%=8*25%=2
1.25*4.2/(0.7/8)简算1.25*4.2/(0.7/8)=1.25×4.2÷0.7×8=(1.25×8)×(4.2÷0.7)=10×6=601.25*4.2/(0.7/8)=1.25*4.2*8/0.7=(1.25*8)*4.2
63*51-67.2/4.2简算63*51-67.2/4.2=3213-16=3197√希望你能看懂,你能明白,望采纳,赞同31973197
7.8乘以4.2加2.2乘以4.2等于(7.8+2.2)乘以4.2这是根据()简算我也不知道这是根据什么简算,好像是乘法分配率.根据(乘法分配率)简算.好像是.2.452.45乘以7.8再乘以2.2=2.45(7.8+2.2)=2.45x1
2.2*(-2.1)+1.21*4.2-2.1*0.22简算!2.2*(-2.1)+1.21*4.2-2.1*0.22=-2.2*2.1+1.21*4.2-2.1*0.22=-2.2*2.1+1.21*2*2.1-2.1*0.22=-2.2
4.2÷1.25+5.8×0.8简算原式=4.2x0.8+5.8x0.8=(4.2+5.8)x0.8=10x0.8=8
8.4除以(4.2乘0.4)简算0.08
(4.2+16.8/8)*5/21简算,(4.2+16.8/8)*5/21=(4.2+2.1)*5/21=6.3*5/21=0.3*5=1.5
3.8乘以4.2加38乘以0.58简算3.8
7.6乘0.58加4.2乘0.76简算=7.6×0.58+7.6×0.42=7.6×(0.58+0.42)=7.6×1=7.6
3.5/4.23.5/4.2=(5*0.7)/(6*0.7)约去0.7得3.5/4.2=5/65/65/63.5/4.2=35/42=5/63.5/4.2=35/42=5/6
简算(1)2.9×0.45+0.29×4.2+0.029×13(2)3.84×9.6+简算(1)2.9×0.45+0.29×4.2+0.029×13(2)3.84×9.6+0.96×61.6
4.2×99+4.2简便运算4.2×(99+1)=420
0.99×8.6简算(1-0.01)×8.6=1*8.6-0.01*8.6=8.6-0.086=8.514(1-0.01)*0.86=0.86-0.0086
8.3*0.99简算8.3*0.99=8.3*(1-0.01)=8.3*1-8.3*0.01=8.3-0.083=8.2178.3*0.99=8.3*(1-0.01)=8.3x1-8.3x0.01=8.3-0.083=8.2178.3*(1