脱式计算①1.5×(0.1÷0.5)+0.18÷0.36②14.55÷(0.72+4.76×3)③800-(418+317)÷21×8.9④494÷19
脱式计算①1.5×(0.1÷0.5)+0.18÷0.36②14.55÷(0.72+4.76×3)③800-(418+317)÷21×8.9④494÷19+15×24-12...
脱式计算①1.5×(0.1÷0.5)+0.18÷0.36②14.55÷(0.72+4.76×3)③800-(418+317)÷21×8.9④494÷19+15×24-125×2⑤6.25×0.8+3.75÷1.2⑥231-17×28÷34+43.
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①1.5×(0.1÷0.5)+0.18÷0.36
=1.5×0.2+0.5
=0.3+0.5
=0.8;
②14.55÷(0.72+4.76×3)
=14.55÷(0.72+14.28)
=14.55÷15
=0.97;
③800-(418+317)÷21×8.9
=800-735÷21×8.9
=800-35×8.9
=800-311.5
=488.5;
④494÷19+15×24-125×2
=26+360-250
=136;
⑤6.25×0.8+3.75÷1.2
=5+3.125
=8.125;
⑥231-17×28÷34+43
=231-17÷34×28+43
=231-0.5×28+43
=231-14+43
=260.
=1.5×0.2+0.5
=0.3+0.5
=0.8;
②14.55÷(0.72+4.76×3)
=14.55÷(0.72+14.28)
=14.55÷15
=0.97;
③800-(418+317)÷21×8.9
=800-735÷21×8.9
=800-35×8.9
=800-311.5
=488.5;
④494÷19+15×24-125×2
=26+360-250
=136;
⑤6.25×0.8+3.75÷1.2
=5+3.125
=8.125;
⑥231-17×28÷34+43
=231-17÷34×28+43
=231-0.5×28+43
=231-14+43
=260.
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