0.4*99-0.4=
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(0.4+0.4)÷0.4+0.4÷0.4=3
1.6×3=0.4×123:0.4=1.6:12呃,有X的才算是解比例呢,这个是比例式.
0.4÷5=0.08
0.4x(99+1)=0.4x100=40
(0.4+0.4)÷0.4-(0.4÷0.4)=1.(0.4+0.4)÷0.4+0.4÷0.4=3.(0.4+0.4+0.4+0.4)÷0.4=4.
0.4*99*0.4=0.4*0.4*(100-1)=0.16*100-0.16=16-0.16=15.84
0.4X=1.2*0.375X=1.125
0.4a+28%(84-a)=30.7240a+28(84-a)=307212a=720a=60
0.4÷0.4+0.4×0.4=1.16
0.4×(0.4-0.4)+0.4-0.4=00.4×(0.4-0.4)+0.4+0.4=0.8
1.y-0.4y=28.82.3.5m+m=7.653.9×17+9a=369解:1y-0.4y=28.8解:3.5m+1m=7.65解:153+9a=369(1-0.4)y=28.8(3.5+1)m
X-0.4X=360.6X=36X=60
0.4x-12.6=8.40.4x=12.6+8.40.4x=21x=210/4x=52.5八分之一:四分之一=十分之一:x4/8=1/10x1/2=1/10x10x=2x=0.2三分之一x+四分之一
0.4×20+0.4x=208+0.4x=200.4x=20-80.4x=12x=12/0.4x=30
1.2/75=0.4/xx=0.4x75÷1.2x=30÷1.2x=25
1.25×(0.8+0.4)=1.25×0.8+1.25×0.4=1+0.5=1.54.89×99+4.89=4.89×(99+1)=489(14.7+5.6)÷7=14.7÷7+5.6÷7=2.1+
(1)原式=(﹣1)^99+2.5^100×(﹣0.4)^101=﹣1+(﹣2.5×4)^100×(﹣0.4)=﹣1﹣0.4=﹣1.4(2)原式=(2X^4Y)^3-(3X^6Y)^2=2X^12Y-
乘法分配=99*0.4-1*0.4=(99-1)*0.4
0.4m=40cm望采纳
0.8+0.8+0.8+0.4+0.4=0.8*4=0.4*8完全正确